Chlorine tabs are generally trichlor which is a stabilized form of chlorine and continually adds cya to your water. Over time, your cya level rises so high that you have to run higher than normal chlorine levels to avoid an algae bloom. That is the part that most people don't know and they continue to run the same chlorine levels as they always. Then they don't know why all of a sudden what has always worked to keep algae away no longer works. There is nothing wrong with using trichlor tabs as long as you monitor your cya levels. We like cya between 30-50 generally. After that, we suggest people stop using it and switch to just using bleach for chlorine. It would probably be a good idea if you posted a complete set of current water testing results taken with a drops based kit. Make sure you include a cya result.
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